DE102020203037A1 - Air suspension strut with an elastic damper mounting - Google Patents

Abstract

Air spring strut (1) for a motor vehicle, comprising an air spring (2) with an integrated shock absorber (3), the air spring (2) comprising an air spring cover (4) and a rolling piston (5), with between the air spring cover (4) and the Rolling piston (5) a rolling bellows (6) made of an elastomeric material is fastened in a pressure-tight manner, as a result of which a volume-elastic pressure space (7) filled with compressed air is limited and the rolling bellows (6) rolls off the rolling piston (5) with the formation of a roll fold (8), wherein the shock absorber (3) comprises a damper tube (18) and a piston rod (19) which can be immersed in the damper tube (18), the piston rod (19) being connected to a damper bearing (20) which is located in a bearing seat (21) of the air spring cover (4) is received, the damper bearing (20) comprising a support piece (24), an elastomer body (25) and a sleeve (26), a closure means (22) being inserted into the bearing receptacle (21) above the damper bearing (20) is, where between an elastic means (33) is arranged between the sleeve (26) and the closure means (22).

Description

The invention relates to an air suspension strut according to the preamble of claim 1.

Air springs or air spring struts which are arranged between a chassis and a body of a motor vehicle are known in a large number of designs. The air spring comprises a rolling bellows which is fastened between a cover and a rolling piston. The air spring is under an internal overpressure during operation and the rolling bellows rolls on the rolling piston when the spring moves, forming a roll fold. To limit expansion, the rolling bellows is enclosed by a sleeve-shaped external guide.

The shock absorber arranged inside the air spring is connected on the one hand to a wheel carrier and on the other hand via its piston rod to a damper bearing which is received in the air spring cover. The air spring cover, in turn, is connected to the vehicle body so that the motor vehicle is sprung and damped. Such an air spring strut is from the document, for example DE 10 2018 204 485 A1 known.

The damper bearing usually comprises a support disk which is fastened to the piston rod by a nut, the support disk being connected to an elastomer body in an airtight manner and encompassed by the latter. The elastomer body as a damping element is also connected to a sleeve on the outside in an airtight manner. The damper bearing is inserted into a bearing receptacle formed in the core area of the air spring cover.

The damper bearing is sealed against the piston rod with an O-ring. A further O-ring is also provided between the bearing seat of the air spring cover and the damper bearing sleeve in order to seal the damper bearing at this point as well. Such a damper bearing is, for example, the document DE 10 2012 012 902 A1 refer to.

The damper bearing is covered by a locking washer for axial fastening. Due to the internal pressure of the pressure chamber of the air spring and the introduction of force from the shock absorber into the damper bearing, the sealing disk inserted in the air spring cover is heavily stressed in the axial direction.

In the case of an air spring cover made of aluminum, the locking disc is held in place with a circlip. A rectangular groove in the aluminum cover is necessary for this. The sleeve of the damper bearing is held down in the air spring cover by the washer with a certain downward pressure. The disadvantage here is that when assembling the air suspension strut, only a slight overpressure of the disk of a few tenths of a millimeter is possible to assemble the circlip.

The groove for the sealing ring is machined in an aluminum cover, this does not pose any major problems. However, if an air spring cover made of a plastic material is used, expensive and complex internal slides have to be used. This creates a disadvantageous degree of mold separation, which is not permissible according to today's requirements. A rectangular groove for the sealing ring also creates a large notch effect, which can lead to an early failure with normal damper bearing forces. It is therefore important to avoid such a groove in the air spring cover.

Another possibility to use the sealing cap in the air spring cover is from the document DE 10 2017 210 543 A1 is known. Here the sealing cap is screwed into the air spring cover.

The object of the invention is to provide an air spring strut with an improved damper bearing, in which a closure cap can be easily and safely inserted into the air spring cover of the air spring strut.

The object on which the invention is based is achieved with the features of claim 1. Preferred embodiments emerge from the subclaims.

According to the invention, an air spring strut for a motor vehicle is provided, comprising an air spring with an integrated shock absorber, the air spring comprising an air spring cover and a rolling piston, a rolling bellows made of an elastomeric material being fastened in a pressure-tight manner between the air spring cover and the rolling piston, whereby a volume-elastic bellows filled with compressed air Pressure space is limited and the rolling bellows rolls with the formation of a roll fold on the rolling piston, the shock absorber comprising a damper tube and a piston rod immersible in the damper tube, the piston rod being connected to a damper bearing, which is received in a bearing seat of the air spring cover, the damper bearing comprises a support piece, an elastomer body and a sleeve, a closure means being inserted into the bearing receptacle above the damper bearing, an elastic means being arranged between the sleeve and the closure means.

The invention deals with the axial fastening of a damper bearing in an air spring cover of an air suspension strut. For this purpose, the bearing receptacle is preferably designed in the form of a cup in the air spring cover. It includes a side wall and a floor. A through hole for the piston rod is provided in the base. The bearing support is represented by the material of the air spring cover. The air spring cover is made of a plastic or a metal.

The damper bearing is then inserted into the bearing seat of the air spring cover. The support piece is at least partially enclosed on the outside by the elastomer body, the elastomer body resting at least partially on the inside of the sleeve. The elastomer body is preferably vulcanized onto the support piece and the sleeve. The bottom of the elastomer body rests at least partially or at certain points on the bottom of the bearing receptacle. The sleeve is in surface contact with the side wall of the bearing receptacle.

Then the piston rod of the shock absorber is pushed through the bore and the support piece and its free end is secured against the support piece with a nut. A sealing ring is used to prevent the compressed air from escaping from the pressure chamber of the air spring along the piston rod.

An elastic means is now advantageously positioned between the sleeve and the closure means to be introduced. The closure means covers the damper bearing from above and is intended to hold it in an axial position. A locking ring is provided for fastening the closure means. This is pressed into the bearing receptacle so that the locking means is properly fixed. An inexpensive metal disc is used as the closure means. A round wire ring is used as a locking ring.

According to a preferred embodiment, the elastic means is set up to exert a force on the sleeve in operative connection with the closure means. The elastic means is preferably arranged in the direction of a longitudinal axis of the air suspension strut between the sleeve and the closure means.

In the assembly process, the closure means is pressed against the elastic means so that the locking ring can be brought into its intended position in a simplified manner. In the prior art, this was not easily possible, since the closure means was always pressed directly against the sleeve. As a result, there was no sufficient tolerance for inserting the locking ring.

The elastic means is deformed by a few millimeters and as soon as the locking ring is pressed in, the locking means is pressed back against the locking ring. A restoring force acts in the elastic means. Due to its elasticity, it can be understood as a spring. This restoring force is greater than the force that is generated by the movement of the damper bearing on the sleeve. This results in a further advantage of the elastic means. Because in the static and dynamic operation of the air suspension strut, the axial forces introduced into the damper bearing by the shock absorber do not act directly on the closure means, but are cushioned by the elastic means. As a result, a simpler construction of the closure means can be used. In the case of an air spring cover made of plastic, in particular, a circumferential groove for the securing ring no longer has to be made in the side wall of the bearing receptacle. This avoids the undesired degrees of mold separation.

According to a further preferred embodiment, the sleeve comprises a flange, between which the elastic means and the closure means are arranged. The flange preferably protrudes radially outward. A flange is understood to be an edge of the sleeve which is bent over by a certain angle. This creates an enlarged contact surface for the sleeve. The flange is particularly preferably designed to run at right angles or at an angle. Compared to the longitudinal axis of the air suspension strut, the flange bends outwards at 90 °. Its top can also run at an angle. It extends outwards either upwards or downwards. In this case, the top of the flange represents a support surface for the elastic means, the elastic means resting at least partially on the flange. At the same time, an upper side of the elastic means rests at least partially on the closure means. The underside of the flange rests against an annular stop on the bearing mount of the air spring cover.

According to a further preferred embodiment, the elastic means is a collar formed by the elastomer body. The collar is preferably made from the material of the elastomer body. The elastomer body is designed or shaped in such a way that an upper circumferential edge is drawn around the flange. This creates a collar which acts as an elastic means. The collar preferably has a wave-shaped or crown-shaped structured upper side. The structure of the collar is determined by its internal damping or spring properties.

An alternative embodiment provides that the elastic means is a rubber ring. The rubber ring is preferably made from a different material than the elastomer body. Instead of using the elastic means from the elastomer body, a separate rubber ring is used. This gives you a free choice of one resilient material, which is adapted to the respective application. The rubber ring is preferably vulcanized or glued to an underside of the closure means. Alternatively, the rubber ring is vulcanized or glued to the sleeve, preferably to the flange of the sleeve. In order to accelerate the assembly process of the closure means, the rubber ring is already connected to the closure means prior to assembly. This means that only one step has to be carried out during assembly.

According to another alternative embodiment, the elastic means is a plate spring. The plate spring is preferably made from a metal or a plastic. Such an elastic plate spring also produces a spring force and is equally suitable as an elastic means. The plate spring preferably comprises an outer edge which rests against the sleeve and an inner edge which rests against the closure means. The disc spring can also be used the other way around. Their modulus of elasticity is decisive.

All embodiments of the elastic means have in common that they are annular. The decisive force of the elastic means is exerted on the sleeve in the circumferential direction. In addition, the end of the piston rod can be located in the center of the elastic means or a control line of the shock absorber can be led out of the elastic means and the closure means.

According to a further preferred embodiment, a sealing means is arranged between the sleeve and the bearing receptacle. For a proper pressure seal, another sealing ring is inserted between the sleeve and the side wall so that no compressed air escapes from the pressure chamber of the air spring along the contact surface. The sealant is preferably vulcanized or glued to the sleeve. Here, too, the assembly process is simplified by the sleeve prepared with sealant. The bearing receptacle preferably has a circumferential ring stop on which the sealing means is received. Instead of making a groove in the material of the bearing seat of the air spring cover, in which the sealant is received, as is usual, a simplified ring stop is now used. In particular, a space for the sealant is formed by the ring stop below the flange. As a result, a groove with a disadvantageous degree of mold separation is no longer necessary.

According to a further preferred embodiment, the sleeve comprises an edge opposite the flange, the edge of the sleeve being spatially spaced from the bottom of the bearing receptacle. This avoids a double fit of the sleeve in the bearing receptacle. Otherwise there would be the risk that the flange does not rest properly on its intended annular stop and that a leak occurs between the sleeve and the side wall. The edge of the sleeve is preferably chamfered on the outside. This makes it easier to insert the sleeve into the bearing receptacle.

The air suspension strut is used in an air suspension system of a motor vehicle. Such is, for example, a passenger car, a sport utility vehicle or a light commercial vehicle.

Further preferred embodiments of the invention emerge from the following description of exemplary embodiments on the basis of the figures.

• 1 ein beispielsgemäßes Luftfederbein mit einem Dämpferlager und einem elastischen Mittel,
• 2 ein erstes Ausführungsbeispiel des elastischen Mittels,
• 3 ein zweites Ausführungsbeispiel des elastischen Mittels,
• 4 ein drittes Ausführungsbeispiel des elastischen Mittels, und
• 5 ein viertes Ausführungsbeispiel des elastischen Mittels.

Show it

• 1 an exemplary air suspension strut with a damper bearing and an elastic means,
• 2 a first embodiment of the elastic means,
• 3 a second embodiment of the elastic means,
• 4th a third embodiment of the elastic means, and
• 5 a fourth embodiment of the elastic means.

the 1 shows an example of an air suspension strut 1 consisting of an air spring 2 and an integrated shock absorber 3 , being air spring 2 an air spring cover 4th , a rolling piston 5 and a rolling bellows 6th includes. Inside air spring 2 is shock absorber 3 provided, taking shock absorbers 3 a damper tube 18th and a piston rod that can be immersed in it 19th includes.

Air spring 2 includes bellows 6th made of elastomeric material, with roll bellows 6th with air spring cover 4th and rolling piston 5 a pressure-tight and volume-variable pressure chamber filled with compressed air 7th limited. A tubular roll bellows is used for this 6th with its upper end on the air spring cover 4th and with its lower end on the rolling piston 5 e.g. via clamping rings 12th attached to the connection areas of these air spring connection parts. With relative movements along a longitudinal axis L. of the air suspension strut 1 between air spring cover 4th and rolling piston 5 rolls bellows 6th with the formation of a roll fold 8th on the rolling surface of the rolling piston 5 away. In addition, roll bellows forms 6th another fold 9 on the air spring cover 4th the end. wrinkle 9 is effective as a cardan bearing. Rolling bellows 6th is also provided with embedded reinforcements. Its reinforcements are arranged in an axial and / or cross position. In addition, one is the rolling bellows 6th at least partially enclosing external guide 10 intended. This is achieved by an inside on the bellows 6th attached tension ring 13th held. External guide 10 limits the lateral expansion of the bellows 6th , especially if it is thin-walled. The filling of the pressure chamber 7th takes place via an air connection 17th on the air spring cover 4th . In the air spring cover 4th a channel is introduced or drilled, which leads from the air connection 17th inside of air spring 2 leads. By air connection 17th is air spring 2 can be filled with a certain amount of compressed air, whereby its spring force can be adjusted.

To protect the bellows from soiling 6th and especially its roll fold 8th is a protective bellows 11 intended. This is with its upper end at the lower end of the outer guide 10 and with its lower end on a fastening ring 15th on the damper tube 18th attached. The attachment of the upper end of the protective bellows 11 on the outside guide 10 takes place through a form fit. The attachment of the lower end of the protective bellows 11 on the fastening ring 15th takes place through a form fit. The lower end of the protective bellows is used for this 11 Shaped in such a way that this is around the fastening ring 15th is turned over.

Air strut 1 causes two functional areas. Air spring 2 takes care of the load capacity generation, while shock absorbers 3 is responsible for the linear guide. As a result, the motor vehicle is sprung and dampened. So that air strut 1 Can be connected to a body section of a motor vehicle, several fastening means 16 proceed. These are in air spring covers 4th at least partially embedded and are inserted through corresponding openings in the body section and then screwed. On the other hand is air strut 1 Via a damper eye, not shown, of the shock absorber 3 connectable to a wheel carrier of the motor vehicle. This regular installation position of the air suspension strut 1 determines the "top / bottom" orientation.

Rolling piston 5 , which is made of a metal or a plastic, is shaped as a hollow cylinder and stands on a support ring 14th of the damper tube 18th arranged. The one in damper tube 18th submersible piston rod 19th is with its upper free end on a damper bearing 20th attached. Shock mount 20th includes a support piece 24 which by means of a washer 31 and a mother 30th at the top of the piston rod 19th is fixed. Between the piston rod 19th and support piece 24 is also an annular sealant 32 provided, which also from above by washer 31 held in position so along by piston rod 19th no compressed air from the pressure chamber 7th escapes. Furthermore, there is a supporting piece 24 on the outside of an elastomer body 25th at least partially enclosed. Elastomer body 25th represents the heart of the shock mount 20th represents and causes a damping function for the shock absorber 3 outgoing forces. Also includes shock mounts 20th a sleeve 26th which elastomer body 25th encloses radially. Elastomer body 25th is on the inside with a support disc 24 and on the outside with a sleeve 26th vulcanized together. These three elements make up the shock mount 20th This is in stock 21 of the air spring cover 4th arranged. Here lies the sleeve 26th on the side wall of the bearing mount 21 at. So that along from sleeve 26th and inventory 21 no compressed air from the pressure chamber 7th can escape, there is also an annular sealant at this point 29 intended.

Stock taking 21 of the air spring cover 4th is cup-shaped and in a core area of the air spring cover 4th intended. It includes a side wall and a floor. In the bottom of the warehouse 21 or the air spring cover 4th is a through hole for the piston rod 19th intended. There is also a stop buffer below the floor 38 arranged to the compression travel of the damper tube 18th to limit and when the stop in the air spring cover 4th to reduce the forces introduced. Air spring cover 4th is made, for example, from a plastic material, for example a thermoplastic or a thermosetting plastic. A version of the air spring cover 4th made of a metal, for example aluminum or steel, is also possible.

Shock mount 20th is through an in air spring cover 4th used closure means 22nd held in position. Closure means 22nd is a metal ring, which is in the air spring cover 4th is inserted. For secure fixation of locking means 22nd becomes a locking ring from above 23 in stock 21 plugged. In the form shown has closure means 22nd an inner opening to allow the control line of the shock absorber 3 can be led to the outside. Closure means 22nd but can also be designed as a solid body and pressure-tight in the air spring cover 4th can be used.

So that closure means 22nd Can be introduced in a simplified manner in the assembly process and a sufficient force on the damper bearing 20th is effected is, for example, an elastic means 33 intended. Its arrangement, mode of operation and configurations will be described in the following 2 until 5 explained in more detail.

2 shows in detail a first embodiment of the elastic means 33 . In the figure there is only air spring cover 4th with shock mount 20th and stop buffers 38 shown. Air spring cover 4th comprises fastening means partially embedded in its plastic material 16 . In the core area of the Air spring cover 4th is inventory 21 educated. This is cup-shaped, comprising a side wall 34 and a floor 35 . In the ground 35 is a through hole in the middle 37 intended for the piston rod of the shock absorber. This shape is created by the respective injection mold for air spring covers 4th . At the bottom of the floor 35 is stop buffer 38 arranged.

In stock 21 is shock mount 20th recorded. Shock mount 20th includes support piece 24 , Elastomer body 25th and sleeve 26th . Elastomer body 25th is on the inside of the support piece 24 vulcanized and with a sleeve on its outside 26th vulcanized. Elastomer body 25th causes a damping function for the shock absorber in the air spring cover 4th introduced forces and enables easy gimbal mobility of the piston rod in the air spring cover 4th . For this purpose, includes the material of the elastomer body 25th the support piece 24 in the way that support piece 24 radially outside, axially at the top and bottom of the elastomer body 25th is covered or enclosed. In addition, there is an elastomer body 25th on the ground 35 the inventory 21 on. The bottom of the elastomer body 25th has a wave or crown structure. So that there is an elastomer body 25th only selectively and not over a large area on the ground 35 at. Part of the top of the elastomer body 25th has a crown-like structure with hemispheres distributed in the circumferential direction. The internal damping properties of the elastomer body are enhanced by special surface shapes 25th co-determined. To the sleeve 26th indicates elastomer body 25th a flat circumferential outer wall. Sleeve 26th is made of a plastic, for example a thermoplastic, or of a metal, for example aluminum. Meanwhile, there is support 24 made of a metal or a metal-plastic combination.

Sleeve 26th comprises, for example, a flange 27 . flange 27 is at the top of the sleeve 26th intended. flange 27 points radially outwards. There is a flange at the bottom 27 double stepped. Stock taking 21 has for sleeve 26th with flange 27 a corresponding shape. Stock taking 21 points from its side wall 34 upwards a double stepped wider diameter. This shows two ring stops. A first ring stop is used to accommodate the sealant 29 . This is located below the stepped flange 27 and outside of the sleeve 26th . In the space between the stepped flange 27 and the first ring stop is some play for sealant 29 calmly. The stepped seat for sealants 29 has the advantage that there is no groove with a disadvantageous degree of mold separation in the material of the air spring cover 4th must be introduced. sealant 29 is separate or on a sleeve 26th vulcanized. A second ring stop is used to accommodate the lower edge surface of the flange 27 . The flange is on the second ring stop 27 essentially on. Sleeve 26th has through flange 27 a wide axial bearing surface, which means that there is a better distribution of forces. This means that smaller tolerance chains can also be adhered to. The second ring stop has a larger diameter than the first ring stop.

Sleeve 26th also includes a lower border 28 . edge 28 is off the ground 35 spatially spaced. There is a small gap. This avoids a double fit. edge 28 is also bevelled on its outside. This will facilitate the insertion of the sleeve 26th and thus the shock mount 20th in stock 21 simplified.

Shock mount 20th is from above by locking means 22nd covered. Closure means 22nd is secured by circlip 23 in stock 21 held. There is a semicircular and circumferential recess in the side wall for this purpose 34 the inventory 21 above the stepped section and above the position for the closure means 22nd into the material of the air spring cover 4th brought in. A locking ring is placed in this recess 23 inserted. Circlip 23 is a round wire ring, which is slightly elastically deformed. This can be used in the recess. Closure means 22nd is an annular disk made of a metallic material, for example steel.

So that closure means 22nd can be introduced in a simplified manner in the assembly process and there is also a contact pressure on the damper bearing 20th causes is, for example, elastic means 33 intended. Elastic means 33 is between sleeve 26th and closure means 22nd arranged. In particular, is elastic means 33 in the longitudinal direction of the air suspension strut axis L. between sleeve 26th and closure means 22nd arranged. In detail is elastic means 33 between flange 27 the sleeve 26th and closure means 22nd arranged. On the one hand, it is at least partially on the underside of the closure means 22nd at. On the other hand, there is elastic means 33 at least partially at the top of the flange 27 at.

Elastic means 33 has the property that it is elastically deformable and causes a restoring force when a force is applied. There is a damper bearing in the assembly process 20th already in stock 21 of the air spring cover 4th . Elastic means 33 lies on the flange 27 on. Closure means 22nd is from above against elastic means 33 put on and pressed down with a certain force. This becomes an elastic medium 33 briefly against flange 27 Pressed with up to 3 to 4 mm until the locking ring 23 snaps into the semicircular recess provided for it. Then the elastic means presses 33 the closure means 22nd back by approx. 1 to 2 mm. This has Closure means 22nd its position below the locking ring 23 taken. Elastic means 33 has a residual compression of approx. 2 to 3 mm. By showing a support surface for the flange 27 the second ring stop also serves as a counterpart for the axial compression of the elastic means 33 . By pressing sealing means 22nd against elastic means 33 the restoring force is generated, which in particular damper bearings 20th is held in its axial position. This restoring force represents a greater axial force than the force caused by the movement of the damper bearing 20th , as well as external sleeve friction forces is generated. As a result, the force network of closure means acts 22nd with locking ring 23 and elastic means 33 those of the shock absorber or piston rod in the shock mount 20th introduced static and especially dynamic forces.

This mode of operation applies to the exemplary embodiment in FIG 2 elastic means shown 33 , as well as for the following embodiments of the elastic means 33 according to the 3 until 5 .

The geometry of the elastic means 33 must be adapted to the axial damper loads. So is elastic means 33 preferably ring-shaped. According to the example is elastic means 33 designed as a circumferential collar, which through the material of the elastomer body 25th is formed. This collar extends from the elastomer body 25th to the outside and is partly on the flange 27 on. It lends itself to elastomeric bodies 25th to be designed and shaped in such a way that it has a flange 27 is pulled. In this embodiment is elastic means 33 in the form of the collar consisting of the material of the elastomer body 25th with flange 27 vulcanized. The top of the elastic means 33 or the collar is designed in the shape of a wave or a crown. This creates elastic means 33 only selectively on the underside of the closure means 22nd at. Other surface structures are also possible. Here, too, the surface structure determines the internal damping properties of the elastic means 33 and thus its restoring force to be applied. Collar can also be used as an encircling one from the elastomeric body 25th the lip that extends away.

In the 3 is a second embodiment of the elastic means 33 shown. The air spring cover shown 4th does not differ from that in 2 shown air spring cover. Therefore, repetitive explanations are dispensed with and the 2 referenced. The same reference numbers are used for identical components. Also with regard to the mode of action of the elastic means 33 in operative connection with closure means 22nd refer to the remarks below 2 referenced.

The second embodiment differs in the shape of the elastic means 33 and shaping the flange 27 from the first embodiment. In the illustration shown is flange 27 the sleeve 26th inclined inwards. Ie the top of the flange 27 runs at an angle of less than 90 ° to the longitudinal axis L. . The inclination can also run obliquely outwards. That would be the top of the flange 27 an angle between 90 ° and 180 ° to the longitudinal axis L. exhibit. In addition, a corrugated structure of the flange top is possible, whereby the restoring force of the elastic means is also possible 33 can be influenced.

Elastic means 33 is in this embodiment also made of the material of the elastomer body 25th educated. Elastic means extends as a collar 33 along the flange 27 up to the side wall 34 the inventory 26th . The top of the elastic means 33 in the form of a collar lies over the entire surface of the underside of the closure means 22nd at. This geometry makes it elastic means 33 adapted to the axial damper loads, which vary depending on the application.

With the 4th becomes a third embodiment of the elastic means 33 indicated which differs from the first and second embodiment. For the air spring cover shown 4th and the mode of action of the elastic agent 33 is based on the descriptions of the 2 referenced.

flange 27 kinks at a right angle from sleeve 26th radially outwards. On this lies elastic means 33 in the form of a rubber ring. Thus is elastic means 33 ring-shaped. The element to be pressed is elastic 33 a different material than elastomer body 25th . This allows elastic means 33 independent of the elastomer body 25th be designed. As a result, the restoring force to be achieved can also be selected more simply depending on the application. A modular principle is available. Elastic means 33 in the form of a rubber ring is on the underside of the closure means 22nd or on flange 27 the sleeve 26th vulcanized or glued on. This simplifies the assembly process, since the rubber ring has a locking means beforehand 22nd is equipped and for assembly as a prefabricated unit with a single step on the shock mount 20th is set.

Elastic means 33 does not have to be designed as a rubber ring. It can also be a ring made of a silicone material. Other similar elastic materials are also conceivable.

Finally, in the 5 a third embodiment is shown, which differs from the previous embodiments in that as an elastic means 33 one Disk spring is used. The disc spring is made of a metal or a plastic. It is ring-shaped and has the shape of the mantle of a flat truncated cone. The outer edge is on the flange 27 the sleeve 26th and is supported on the side wall 34 the inventory 21 away. The inner edge is slightly flattened and lies on the underside of the closure means 22nd at. When pressing down the locking means 22nd the inner edge tilts downwards and as soon as the contact pressure is reduced, the restoring force of the plate spring acts against the locking means 22nd . This becomes a closure means 22nd brought into its intended position and also sleeve 26th held in operation.

Regarding the air spring cover 4th and the other mode of action of the plate spring as an elastic means 33 will return to the remarks of the 2 referenced.

List of reference symbols

1

Air strut

2

Air spring

3rd

Shock absorbers

4th

Air spring cover

5

Rolling piston

6th

Rolling bellows

7th

Printing room

8th

Roll fold

9

wrinkle

10

External guide

11

Protective bellows

12th

Clamping ring

13th

Tension ring

14th

Support ring

15th

Fastening ring

16

Fasteners

17th

Air connection

18th

Damper tube

19th

Piston rod

20th

Shock mount

21

Stock taking

22nd

Cap

23

Circlip

24

Support piece

25th

Elastomer body

26th

Sleeve

27

flange

28

edge

29

sealant

30th

mother

31

Washer

32

sealant

33

elastic means

34

Stock taking

35

Side wall

36

floor

37

Through hole

38

Stop buffer

L.

Longitudinal axis

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102018204485 A1 [0003]
• DE 102012012902 A1 [0005]
• DE 102017210543 A1 [0009]

Claims (15)

Air spring strut (1) for a motor vehicle, comprising an air spring (2) with an integrated shock absorber (3), the air spring (2) comprising an air spring cover (4) and a rolling piston (5), with between the air spring cover (4) and the Rolling piston (5) a rolling bellows (6) made of an elastomeric material is fastened in a pressure-tight manner, as a result of which a volume-elastic pressure space (7) filled with compressed air is limited and the rolling bellows (6) rolls off the rolling piston (5) with the formation of a roll fold (8), wherein the shock absorber (3) comprises a damper tube (18) and a piston rod (19) which can be immersed in the damper tube (18), the piston rod (19) being connected to a damper bearing (20) which is located in a bearing seat (21) of the air spring cover (4) is received, the damper bearing (20) comprising a support piece (24), an elastomer body (25) and a sleeve (26), a closure means (22) being inserted into the bearing receptacle (21) above the damper bearing (20) is, thereby known shows that an elastic means (33) is arranged between the sleeve (26) and the closure means (22). Air suspension strut (1) Claim 1 , characterized in that the elastic means (33) is set up to bring about a force on the sleeve (26) in operative connection with the closure means (22). Air suspension strut (1) Claim 1 or 2 , characterized in that the sleeve (26) comprises a flange (27), in particular protruding radially outward, between which the elastic means (33) and the closure means (22) are arranged. Air suspension strut (1) according to one of the Claims 1 until 3 , characterized in that the elastic means (33) is a collar formed by the elastomer body (25). Air suspension strut (1) Claim 4 , characterized in that the collar has a wave-shaped or crown-shaped structured top. Air suspension strut (1) according to one of the Claims 1 until 3 , characterized in that the elastic means (33) is a rubber ring. Air suspension strut (1) Claim 6 , characterized in that the rubber ring is vulcanized or glued to an underside of the closure means (22) or to the sleeve (27). Air suspension strut (1) according to one of the Claims 1 until 3 , characterized in that the elastic means (33) is a plate spring. Air suspension strut (1) Claim 8 , characterized in that the disc spring comprises an outer edge which rests against the sleeve (26) and comprises an inner edge which rests against the closure means (22). Air suspension strut (1) according to one of the Claims 1 until 9 , characterized in that the elastic means (33) is annular. Air suspension strut (1) according to one of the Claims 1 until 10 , characterized in that a sealing means (29) is arranged between the sleeve (26) and the bearing receptacle (21). Air suspension strut (1) Claim 11 , characterized in that the sealing means (29) is vulcanized or glued to the sleeve (26). Air suspension strut (1) Claim 11 or 12th , characterized in that the bearing receptacle (21) has a circumferential ring stop on which the sealing means (29) is received. Air suspension strut (1) according to one of the Claims 1 until 13th , characterized in that the bearing receptacle (21) comprises a base (35), wherein the sleeve (26) comprises an edge (28) opposite the flange (27), the edge (28) of the sleeve (26) spatially from the The bottom (35) of the bearing receptacle (21) is spaced apart. Motor vehicle with an air spring strut (1) according to one of the preceding claims.

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